250 BOTANY. territory. A tree 20-30 feet high, at Willow Spring, Arizona, at an altitude of 7,500 feet, Rothrock (252), 1874. Var. PUNGENS, Engelm. I. c; Q. pungens, Liebm.—Shrubby, leaves much smaUer, often only 1' long, of paler color and rigid coriaceous texture, spiny-dentate, often somewhat persistent; acorns smaller, mostly elongated, with tomentose, scaly, usually less knobby cups. Collected throughout Arizona by the different Expeditions. Var. oblongata ; Q. oblongifolia, Torr. Bot. Mex. Bound 206, not Bot Sitgr.—Shrub or small tree with small (1-! J' long), oblong, more or less entire, pale, coriaceous leaves, smooth and shining above, scarcely reticulate below; acorns long-peduncled.—On the Mesa south of Black River, Arizona, and in Rocky Canon, Arizona, Rothrock (292), 1874. A form of this, var. grandifolia, Engelm. I. c, with leaves 3-5' long, and peduncles 2-3' in length, occurs occasionally from Southern Colorado to Arizona. Var. GEISEA, Engelm. I.e.; Q.grisea, Liebm.—With similar-shaped, entire or irregularly dentate, very thick leaves, often cordate at base, below strongly reticulate, and, like the branchlets, yellowish pubescent, with lar¬ ger, subsessile or short-peduncled acorns. A bush or small tree, 20° high.— Camp Apache, Dr. Girard, G. K. Gilbert, and at Camp Bowie, Rothrock (508), 1874. This form evidently connects with the next species. QuEECus EETICULATA, H. B K.—A shrubby White Oak, with coarse, persistent, short-petioled, obovate leaves, cordate at base, broader and obtuse above, repandly spinous-dentate, strongly reticulate, and below, together with the branchlets, fulvous-tomentose, sparsely stellate-hairy above; fruit-peduncles about half as long as the leaves or shorter, bearing one to several acorns in deep, strongly tuberculate cups.—On Mount Gra¬ ham, Arizona, at 9,600 feet altitude, Rothrock, 1874 (759). A shrub, 2-4 feet high, with leaves 2' long and 1 J' wide. It agrees perfectly with the Mexican forms, which, however, seem to make large trees, often with larger leaves; the leaves of the previous year are found to be persistent even as late as September. QuEECus Emoryi, Torrey, Bot. Emory's Exped 1848, 151, t 9, not of Bot Mex. Bound.; Engelm. I. c. 382 and 394; Quercus hastata, liebm.—A shrubby or arborescent Black Oak, with rough, black bark, and dark-green